ETI Sound Systems, INC ACT-1515X(F) Features & Benefits, Amplifier Module Precautions, Exposure To

The B-52 Pro-Audio speakers described in this instruction manual are intended for use directly on the floor, ground or stage. The ACT-1515X
described in this manual should NEVER be flown. This model is intended primarily for use in mobile installations. A flyable version of the
ACT-1515X, the ACT-1515XF has flying hardware installed which is suitable for suspending a single ACT-1515XF.
Repeated exposure to direct sun will significantly shorten the useful life of the loudspeaker system. Avoid exposing the system to
the elements whenever possible. Long term exposure to rain, high humidity and/or ultra violet rays will cause premature aging to the speaker
system. Prolonged use of the ACT-1515X(F) outdoors or in high-moisture areas can damage the speaker system and amplifier.
			Because of the forces needed to reach high SPL’s at low frequencies, the
FEATURES & BENEFITS
			intense vibrations of the woofers may cause the cabinet to move during a
• New 15-160 Driver specifically designed and manufactured for the			performance. When placed on slick surfaces such as polished wood or smooth
ACT-1515X active systems.		These woofers are optimized for both	tiles, the speaker may move (walk off the stage) during use. Precautions should
efficiency and low frequency performance			be taken to ensure the speaker system does not fall or slide off a stage or raised
• New Large format Waveguide - optimized for the longer throw			surface. A high friction surface, like carpeting, works best to prevent this.
required from a large cabinet. Waveguide provides ideal radiation				Make sure cables routed to and from the ACT-1515X(F) (and
impedance to its compression driver (Selenium D-210) down to 800hz			any other connected loudspeakers) are secured with great care to prevent
• New Amplifier! - The new Class H ACT-1515X amplifier is designed to			accidents. Use all normal and necessary means to insure a safe performance!
deliver 1000 watts of power without sacrificing sound quality or			USING THE ACT-1515X(F) WITH A SUBWOOFER
reliability.
• System Equalization	- built into the amplifier to act as the perfect		In order to use the ACT-1515X(F) with a subwoofer, an electronic crossover must be
complement to the system loudspeaker components			placed between the mixer and the power amplifier stages of the respective speakers.
• Compression circuitry - of high sophistication allows impressive SPLs			This will divide the signal by frequency range, and route the appropriate range of
while minimizing the	risk	of damage to either the amplifier or	frequencices to the appropriate devices. Our recommendation for a starting point is
			100 hz. You can experiment with different frequency settings of the crossover to find
loudspeakers
			what works best for you. Since “the best” setting will depend on a number of factors,
• Cabinet construction -	Legendary B-52 cabinet quality and reliability;
			there is no one correct answer for this question. Those factors influencing the best
road worthy and professional grade.
			choice of crossover point are:
• Painted finish - For a lasting appearance the equal to or better than			•	Spectral distribution of the music.
cabinets costing much more			•	Relative efficiency of subwoofer vs full range system
• Premium sound quality - With extraordinary output for less money			•	Maximum power available to full range and subwoofer system
than its competitors, the hallmark of B-52 speaker systems.			•	Low frequency compression of subwoofer
			•	Room acoustics
			•	Position of listener(s)
			•	Physical distance(s) from full range to subwoofer
			•	How much bass the DJ likes....
			Since some of these parameters are not within our control, (especially the last one) the
			best method is to set the crossover frequency so that both amps tend to go into clipping
			at about the same time. Otherwise when one will compress, the other will not, and the
			result will be a level dependent shift in the spectral balance of the music.
				Keeping your levels set so that the amps go into clipping as infrequently as
			possible will give your speakers, amplifiers and ears a longer life, and is our advice.
			HEARING DAMAGE
			AND PROLONGED
			EXPOSURE TO
			EXCESSIVE SPL’S
Amplifier Module Precautions			B-52 Pro-Audio speakers can produce sound
			levels high enough to cause permanent hearing
Do not attempt to service the ACT-1515X(F) by yourself. Refer all servicing to a B-52			damage to performers, production crews or
Pro-Audio Authorized dealer, or other qualified servicing personnel.			people in the audience. Hearing protection
Service may be required if and when:			devices are recommended for use where long-
• The ACT-1515X(F) has had liquid spilled or objects have fallen inside the speaker system.
			term exposure to high SPLs is not avoidable.
• A heavy object(s) has/have fallen onto the speaker
			Remember, if it hurts, it is definitely too loud!
• The cabinet, amp or speaker has been damaged
• The speakers have been exposed to excessive rain or moisture			Long exposures to high SPLs cause first
• The cabinet has been dropped hard enough to cause damage			temporary threshold shifts; limiting your ability
• The amp has failed to turn on and has AC mains power available			to hear the actual loudness and exercise good judgment. Repeated long term exposure to high SPLs can and
• The amp or speaker(s) does not operate normally or as it should
			WILL CAUSE PERMANENT HEARING LOSSES!
• Keep your ACT-1515X(F) amplifier away from any heat source.
• Do not cover your ACT-1515X(F) amplifier so that the heat sink is partially or totally obstructed; doing so			Please note the recommended exposure limits (right) in Table G-16. More information about these
will likely result in amplifier overheating, triggering the shutdown or failure of the amp.
• In the unlikely event that the amp is being run so hard and long as to cause it to continually go into protect			limits is available on the US government Occupational Safety and Health (OSHA) website at: www.osha.gov
mode and shut down, this result can be moderated by employing a fan to blow air (the colder the better)			The table (above) is shown at:

across the amplifier heat sink fins. If this shutdown is happening without the amber Protect LED coming on,	http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_id=9735&p_table=STANDARDS	3
or the RED Limit LED coming on often, then this may be a sign of a damaged amplifier.